Comparison results

Highlight Differences

RS422+

RS822+

RS1221+

Hardware Specifications
CPU
CPU Model	AMD Ryzen R1600	AMD Ryzen V1500B	AMD Ryzen V1500B
CPU Quantity	1	1	1
CPU Core	2	4	4
CPU Architecture	64-bit	64-bit	64-bit
CPU Frequency	2.6 (base) / 3.1 (turbo) GHz	2.2 GHz	2.2 GHz
Hardware Encryption Engine
Memory
System Memory	2 GB DDR4 ECC	2 GB DDR4 ECC SODIMM	4 GB DDR4 ECC SODIMM
Memory Module Pre-installed		2 GB (2 GB x 1)	4 GB (4 GB x 1)
Total Memory Slots		2	2
Maximum Memory Capacity		32 GB (16 GB x 2)	32 GB (16 GB x 2)
Notes	Synology reserves the right to replace memory modules with the same or higher frequency based on supplier's product life cycle status. Rest assured that the compatibility and stability have been strictly verified with the same benchmark to ensure identical performance.	Synology reserves the right to replace memory modules with the same or higher frequency based on supplier's product life cycle status. Rest assured that the compatibility and stability have been strictly verified with the same benchmark to ensure identical performance. Please select Synology memory modules for optimum compatibility and reliability. Synology will not provide complete product warranty or technical support if non-Synology memory modules are used for memory expansion. For multi-module memory configurations, all modules must be identical and share the same model number. Check the Product Manual of your Synology product for recommended memory configurations.	Synology reserves the right to replace memory modules with the same or higher frequency based on supplier's product life cycle status. Rest assured that the compatibility and stability have been strictly verified with the same benchmark to ensure identical performance. Please select Synology memory modules for optimum compatibility and reliability. Synology will not provide complete product warranty or technical support if non-Synology memory modules are used for memory expansion. For multi-module memory configurations, all modules must be identical and share the same model number. Check the Product Manual of your Synology product for recommended memory configurations.
Storage
Drive Bays	4	4	8
Maximum Drive Bays with Expansion Unit		8 (RX418 x 1)	12 (RX418 x 1)
Drive Type (See all supported drives)	3.5" SATA HDD 2.5" SATA SSD	3.5" SATA HDD 2.5" SATA SSD	3.5" SATA HDD 2.5" SATA HDD 2.5" SATA SSD
Hot Swappable Drive*
External Ports
RJ-45 1GbE LAN Port	2	4	4
USB 3.2 Gen 1 Port*	1	2	2
Expansion Port		1	1
Expansion Port Type		eSATA	eSATA
Notes	This device's 1GbE LAN ports have a maximum transmission unit (MTU) size of 1,500 bytes.	This device's 1GbE LAN ports have a maximum transmission unit (MTU) size of 1,500 bytes.
PCIe
PCIe Expansion	1 x Gen3 x2 network upgrade slot	1 x Gen3 x8 slot (x4 link)	1 x Gen3 x8 slot (x4 link)
Appearance
Form Factor (RU)	1U	1U	2U
Size (Height x Width x Depth)	44 mm x 478 mm x 327.5 mm	44 mm x 480 mm x 492.6 mm	88 mm x 482 mm x 306.6 mm
Weight	4.38 kg	6.4 kg	6.9 kg
Rack Installation Support*	4-post 19" rack (Synology Rail Kit - RKM114/RKS-02) 2-post 19" rack (direct mounting)	4-post 19" rack (Synology Rail Kit - RKM114/RKS-02)	4-post 19" rack (Synology Rail Kit - RKM114/RKS-02) 2-post 19" rack (direct mounting)
Notes	The rail kit is sold separately	The rail kit is sold separately	The rail kit is sold separately
Others
System Fan	40 mm x 40 mm x 3 pcs	40 mm x 40 mm x 3 pcs	80 mm x 80 mm x 2 pcs
Fan Speed Mode	Full-Speed Mode Cool Mode Quiet Mode	Full-Speed Mode Cool Mode Quiet Mode	Full-Speed Mode Cool Mode Quiet Mode
Power Recovery
Noise Level*	28.5 dB(A)	27.4 dB(A)	37.8 dB(A)
Scheduled Power On / Off
Wake on LAN / WAN
Power Supply Unit / Adapter	100 watts	150 watts	250 watts
AC Input Power Voltage	100V to 240V AC	100 V to 240 V AC	100 V to 240 V AC
Power Frequency	50/60 Hz, Single Phase	50/60 Hz, Single Phase	50/60 Hz, Single Phase
Power Consumption	37.93 watts (Access) 13.43 watts (HDD Hibernation)	47.69 watts (Access) 16.7 watts (HDD Hibernation)	49.89 watts (Access) 22.64 watts (HDD Hibernation)
British Thermal Unit	129.42 BTU/hr (Access) 45.83 BTU/hr (HDD Hibernation)	162.83 BTU/hr (Access) 57.02 BTU/hr (HDD Hibernation)	170.23 BTU/hr (Access) 77.25 BTU/hr (HDD Hibernation)
Notes	For more information on how power consumption is measured, refer to this article. Noise testing was conducted with the Synology system fully installed with Synology SATA HDDs and in an idle state. Two GRAS 40AE microphones are placed at a 1 m distance from the front and rear of the device. Background noise: 16.49-17.51 dB(A); Temperature: 24.25-25.75˚C; Humidity: 58.2-61.8%	For more information on how power consumption is measured, refer to this article. Noise testing was conducted with the Synology system fully installed with Synology SATA HDDs and in an idle state. Two GRAS 40AE microphones are placed at a 1 m distance from the front and rear of the device. Background noise: 16.49-17.51 dB(A); Temperature: 24.25-25.75˚C; Humidity: 58.2-61.8%	Power consumption is measured when it is fully loaded with Western Digital 1TB WD10EFRX hard drive(s). Noise Level Testing Environment: Fully loaded with Seagate 2TB ST2000VN000 hard drive(s) in the idle state. Two G.R.A.S. Type 40AE microphones, each set up 1 meter away from the Synology NAS at the front and rear. Background noise: 16.49-17.51 dB(A); Temperature: 24.25-25.75˚C; Humidity: 58.2-61.8%
Temperature
Operating Temperature	0°C to 35°C (32°F to 95°F)	0°C to 35°C (32°F to 95°F)	0°C to 35°C (32°F to 95°F)
Storage Temperature	-20°C to 60°C (-5°F to 140°F)	-20°C to 60°C (-5°F to 140°F)	-20°C to 60°C (-5°F to 140°F)
Relative Humidity	5% to 95% RH	5% to 95% RH	5% to 95% RH
Certification	FCC CE BSMI VCCI RCM UKCA EAC CCC KC BIS	FCC CE BSMI VCCI RCM UKCA EAC CCC KC UL	FCC CE BSMI VCCI RCM EAC CCC KC BIS UL
Warranty	3-year hardware warranty, extendable to 5 years with Extended Warranty Plus	3-year hardware warranty, extendable to 5 years with Extended Warranty Plus	3-year hardware warranty, extendable to 5 years with Extended Warranty Plus
Notes	The warranty period starts from the purchase date as stated on your purchase receipt. (Learn more) Extended Warranty Plus is only available in Europe and North America. Refer to the Extended Warranty Plus website for details on supported countries/regions. (Learn more)	The warranty period starts from the purchase date as stated on your purchase receipt. (Learn more) Extended Warranty Plus is only available in Europe and North America. Refer to the Extended Warranty Plus website for details on supported countries/regions. (Learn more)	The warranty period starts from the purchase date as stated on your purchase receipt. (Learn more) Extended Warranty Plus is only available in Europe and North America. Refer to the Extended Warranty Plus website for details on supported countries/regions. (Learn more)
Environment	RoHS Compliant	RoHS Compliant	RoHS Compliant
Packaging Content	Main Unit X 1 Accessory Pack X 1 AC Power Cord X 1 Quick Installation Guide X 1	Main Unit X 1 Accessory Pack X 1 AC Power Cord X 1 Quick Installation Guide X 1	Main Unit X 1 Accessory Pack X 1 AC Power Cord X 1 C13 to C14 power cord x 1 Quick Installation Guide X 1
Optional Accessories	Enterprise Series 3.5" SATA HDD: HAT5300 Series Plus Series 3.5" SATA HDD: HAT3300 Series Enterprise Series 2.5" SATA SSD: SAT5200 Series 10GbE Network Upgrade Module: E10G22-T1-Mini Rail Kit Sliding: RKS-02 Rail Kit Mounted: RKM114*	DDR4 ECC SODIMM: D4ES02-4G/D4ES02-8G/D4ES01-16G Expansion Units: RX418 Enterprise Series 3.5" SATA HDD: HAT5300 Series Plus Series 3.5" SATA HDD: HAT3300 Series Enterprise Series 2.5" SATA SSD: SAT5200 Series M.2 SSD & 10GbE Combo Adapter Card: E10M20-T1 M.2 SSD Adapter Card: M2D20/M2D18 25GbE Network Interface Card: E25G30-F2 10GbE Network Interface Card: E10G30-F2/E10G30-T2/E10G18-T1 Rail Kit Sliding: RKS-02 Rail Kit Mounted: RKM114*	DDR4 ECC SODIMM: D4ES01-4G/D4ES01-8G/D4ECSO-2666-16G Expansion Units: RX418 Enterprise Series 3.5" SATA HDD: HAT5300 Series Plus Series 3.5" SATA HDD: HAT3300 Series Enterprise Series 2.5" SATA SSD: SAT5200 Series M.2 SSD & 10GbE Combo Adapter Card: E10M20-T1 M.2 SSD Adapter Card: M2D20/M2D18 25GbE Network Interface Card: E25G30-F2 10GbE Network Interface Card: E10G30-F2/E10G30-T2/E10G18-T1 Rail Kit Sliding: RKS-02 Rail Kit Mounted: RKM114*
Notes	Certain items may not be available in your location. Please contact your local distributors for more information.	Certain items may not be available in your location. Please contact your local distributors for more information. Upgrade to DSM 7.2-64551 or later before installing the M2D18.	Certain items may not be available in your location. Please contact your local distributors for more information. Upgrade to DSM 7.2-64551 or later before installing the M2D18. All memory modules will operate at the maximum frequency specified by the CPU manufacturer.

DSM Specifications
Storage Management
Maximum Single Volume Size	108 TB	108 TB	108 TB
Maximum Internal Volume Number	64	64	64
SSD Read/Write Cache (Determining cache size)
SSD TRIM
Supported RAID Type	Synology Hybrid RAID Basic JBOD RAID 0 RAID 1 RAID 5 RAID 6 RAID 10	Synology Hybrid RAID Basic JBOD RAID 0 RAID 1 RAID 5 RAID 6 RAID 10	Synology Hybrid RAID Basic JBOD RAID 0 RAID 1 RAID 5 RAID 6 RAID 10
RAID Migration	Basic to RAID 1 Basic to RAID 5 RAID 1 to RAID 5 RAID 5 to RAID 6	Basic to RAID 1 Basic to RAID 5 RAID 1 to RAID 5 RAID 5 to RAID 6	Basic to RAID 1 Basic to RAID 5 RAID 1 to RAID 5 RAID 5 to RAID 6
Volume Expansion with Larger HDDs	Synology Hybrid RAID RAID 1 RAID 5 RAID 6 RAID 10	Synology Hybrid RAID RAID 1 RAID 5 RAID 6 RAID 10	Synology Hybrid RAID RAID 1 RAID 5 RAID 6 RAID 10
Volume Expansion by Adding a HDD	Synology Hybrid RAID JBOD RAID 5	Synology Hybrid RAID JBOD RAID 5 RAID 6 (with Expansion Unit)	Synology Hybrid RAID JBOD RAID 5 RAID 6
Global Hot Spare Supported RAID Type	Synology Hybrid RAID RAID 1 RAID 5	Synology Hybrid RAID RAID 1 RAID 5 RAID 6 (with Expansion Unit) RAID 10 (with Expansion Unit)	Synology Hybrid RAID RAID 1 RAID 5 RAID 6 RAID 10
Notes	Usable capacity for each volume will be lower than the maximum volume size and is dependent on the filesystem and the amount of system metadata stored. Actual maximum storage pool and volume sizes vary depending on drives used, the number of drive bays available, and the RAID configuration.	Usable capacity for each volume will be lower than the maximum volume size and is dependent on the filesystem and the amount of system metadata stored. Each internal volume (may consist of multiple drives) is expandable up to 108TB.	Usable capacity for each volume will be lower than the maximum volume size and is dependent on the filesystem and the amount of system metadata stored. Each internal volume (may consist of multiple drives) is expandable up to 108TB.
File System
Internal Drives	Btrfs ext4	Btrfs ext4	Btrfs ext4
External Drives	Btrfs ext4 ext3 FAT NTFS HFS+ exFAT	Btrfs ext4 ext3 FAT NTFS HFS+ exFAT	Btrfs ext4 ext3 FAT NTFS HFS+ exFAT
File Services
File Protocol	SMB AFP NFS FTP WebDAV Rsync	SMB AFP NFS FTP WebDAV Rsync	SMB AFP NFS FTP WebDAV Rsync
Maximum Concurrent SMB/AFP/FTP Connections	500	500	1,000
Maximum Concurrent SMB/AFP/FTP Connections (with RAM expansion)		2,000	2,000
Windows Access Control List (ACL) Integration
NFS Kerberos Authentication
Notes	The testing standard was based on the maximum number of concurrent connections supported by this model. During the testing, 25% of the connections were used to transfer files concurrently. The transfer process guaranteed that the connections were not interrupted; the minimum transfer speed was not guaranteed.	Regarding data concerning tests with RAM expansion, all memory slots are installed with the maximum capacity of supported RAM. The testing standard was based on the maximum number of concurrent connections supported by this model. During the testing, 25% of the connections were used to transfer files concurrently. The transfer process guaranteed that the connections were not interrupted; the minimum transfer speed was not guaranteed.	Regarding data concerning tests with RAM expansion, all memory slots are installed with the maximum capacity of supported RAM. The testing standard was based on the maximum number of concurrent connections supported by this model. During the testing, 25% of the connections were used to transfer files concurrently. The transfer process guaranteed that the connections were not interrupted; the minimum transfer speed was not guaranteed.
Account & Shared Folder
Maximum Local User Accounts	2,048	2,048	2,048
Maximum Local Groups	256	256	256
Maximum Shared Folder	512	512	512
Maximum Shared Folder Sync Tasks	8	8	16
Hybrid Share
Hybrid Share Folder Number	10	10	10
Hyper Backup
Folder and Package Backup
Entire System Backup
Notes	Full-system backup requires DSM 7.2 or later.	Full-system backup requires DSM 7.2 or later.	Full-system backup requires DSM 7.2 or later.
High Availability
Synology High Availability
Log Center
Syslog Events per Second	800	800	1,000
Virtualization
VMware ESXi 6.5 and VAAI
Windows Server 2016
Windows Server 2019
Windows Server 2022
Citrix Ready
OpenStack
General Specifications
Supported Protocols	SMB1 (CIFS), SMB2, SMB3, NFSv3, NFSv4, NFSv4.1, NFS Kerberized sessions, iSCSI, HTTP, HTTPs, FTP, SNMP, LDAP, CalDAV	SMB1 (CIFS), SMB2, SMB3, NFSv3, NFSv4, NFSv4.1, NFS Kerberized sessions, iSCSI, HTTP, HTTPs, FTP, SNMP, LDAP, CalDAV	SMB1 (CIFS), SMB2, SMB3, NFSv3, NFSv4, NFSv4.1, NFS Kerberized sessions, iSCSI, HTTP, HTTPs, FTP, SNMP, LDAP, CalDAV
Supported Browsers	Chrome Firefox Edge Safari	Chrome Firefox Edge Safari	Chrome Firefox Edge Safari
Supported Language	English, Deutsch, Français, Italiano, Español, Dansk, Norsk, Svenska, Nederlands, Русский, Polski, Magyar, Português do Brasil, Português Europeu, Türkçe, Český, ภาษาไทย, 日本語, 한국어, 繁體中文, 简体中文	English, Deutsch, Français, Italiano, Español, Dansk, Norsk, Svenska, Nederlands, Русский, Polski, Magyar, Português do Brasil, Português Europeu, Türkçe, Český, ภาษาไทย, 日本語, 한국어, 繁體中文, 简体中文	English, Deutsch, Français, Italiano, Español, Dansk, Norsk, Svenska, Nederlands, Русский, Polski, Magyar, Português do Brasil, Português Europeu, Türkçe, Český, ภาษาไทย, 日本語, 한국어, 繁體中文, 简体中文
Notes	For an updated list of supported browser versions, check the DSM Technical Specifications.	For an updated list of supported browser versions, check the DSM Technical Specifications.	For an updated list of supported browser versions, check the DSM Technical Specifications.

Add-on Packages view the complete package list
Central Management System
Synology Chat
Suggested Users	100	150	150
Notes	Measured with simulated users, each with an average record of 20,000 messages, emojis, or stickers. The required server response time is below ten seconds. Models with expandable memory are tested with their maximum supported memory.	Measured with simulated users, each with an average record of 20,000 messages, emojis, or stickers. The required server response time is below ten seconds. Models with expandable memory are tested with their maximum supported memory.	Models with expandable memory are tested with their maximum supported memory.
Download Station
Maximum Concurrent Download Tasks	80	80	80
SAN Manager
Maximum iSCSI Target Number	128	128	128
Maximum LUN	256	256	256
LUN Clone/Snapshot, Windows ODX
Synology MailPlus / MailPlus Server
Free Email Accounts		5 (Additional accounts require purchase of licenses)	5 (Additional accounts require purchase of licenses)
Suggested Users		750	750
Notes		Suggested users is derived from testing in an environment with 20% heavy users (each with 20,000 pre-populated emails and receiving 240 emails per day) and 80% light users (each receiving an average of 20 emails per day). Learn more The performance of the mail system will slightly decrease in high-availability mode due to data synchronization between the two servers. Functions that were enabled in all of the tests above: anti-spam, anti-virus, DNSBL, greylist, content scan, full-text search (English only). Models with expandable memory are tested with their maximum supported memory. To estimate the RAM requirement for your NAS, please read this article.	Suggested users is derived from testing in an environment with 20% heavy users (each with 20,000 pre-populated emails and receiving 240 emails per day) and 80% light users (each receiving an average of 20 emails per day). Learn more The performance of the mail system will slightly decrease in high-availability mode due to data synchronization between the two servers. Functions that were enabled in all of the tests above: anti-spam, anti-virus, DNSBL, greylist, content scan, full-text search (English only). Models with expandable memory are tested with their maximum supported memory. To estimate the RAM requirement for your NAS, please read this article.
Media Server
DLNA Compliance
Synology Photos
Facial Recognition
Object Recognition
Notes		Object recognition requires an upgrade of memory capacity to a minimum of 4 GB.
Snapshot Replication
Maximum Snapshots per Shared Folder	1,024	1,024	1,024
Maximum of System Snapshots	65,536	65,536	65,536
Surveillance Station
Default Licenses	2 (Additional cameras require purchase of licenses)	2 (Additional cameras require purchase of licenses)	2 (Additional cameras require purchase of licenses)
Suggested Maximum IP Cameras and Total FPS (H.264)	1080p: 40 channels, 800 FPS 3M: 35 channels, 350 FPS 5M: 28 channels, 280 FPS 4K: 17 channels, 170 FPS	1080p: 40 channels, 800 FPS 3M: 35 channels, 350 FPS 5M: 28 channels, 280 FPS 4K: 17 channels, 170 FPS	1080p: 40 channels, 1050 FPS 3M: 40 channels, 600 FPS 5M: 40 channels, 440 FPS 4K: 32 channels, 320 FPS
Suggested Maximum IP Cameras and Total FPS (H.265)	1080p: 40 channels, 1200 FPS 3M: 40 channels, 600 FPS 5M: 40 channels, 480 FPS 4K: 20 channels, 200 FPS	1080p: 40 channels, 1200 FPS 3M: 40 channels, 600 FPS 5M: 40 channels, 480 FPS 4K: 20 channels, 200 FPS	1080p: 40 channels, 1200 FPS 3M: 40 channels, 1120 FPS 5M: 40 channels, 600 FPS 4K: 40 channels, 480 FPS
Notes	Performance figures are obtained from testing conducted with the device fully populated with drives, with their default memory configuration, and under a continuous recording setup. Actual system capabilities may vary based on configuration, drive performance, enabled features, and the presence of additional workloads. Use NVR Selector to quickly find a suitable model based on your requirements. The number of streams that can be viewed simultaneously is twice the suggested maximum number of cameras. For example, if the suggested maximum number of cameras for a model is 10 under H.264, 1080p, the model can support up to 20 streams of the same specification at the same time.	Performance figures are obtained from testing conducted with the device fully populated with drives, with their default memory configuration, and under a continuous recording setup. Actual system capabilities may vary based on configuration, drive performance, enabled features, and the presence of additional workloads. Use NVR Selector to quickly find a suitable model based on your requirements. The number of streams that can be viewed simultaneously is twice the suggested maximum number of cameras. For example, if the suggested maximum number of cameras for a model is 10 under H.264, 1080p, the model can support up to 20 streams of the same specification at the same time.	Performance figures are obtained from testing conducted with the device fully populated with drives, with their default memory configuration, and under a continuous recording setup. Actual system capabilities may vary based on configuration, drive performance, enabled features, and the presence of additional workloads. Use NVR Selector to quickly find a suitable model based on your requirements. The number of streams that can be viewed simultaneously is twice the suggested maximum number of cameras. For example, if the suggested maximum number of cameras for a model is 10 under H.264, 1080p, the model can support up to 20 streams of the same specification at the same time.
Synology Drive
Recommended Number of Concurrent Sync Clients	350 (the number of connections that can be maintained when the recommended number of hosted files was reached)	550 (the number of connections that can be maintained when the recommended number of hosted files was reached)	550 (the number of connections that can be maintained when the recommended number of hosted files was reached)
Recommended Number of Hosted Files	5,000,000 (applies to files indexed or hosted by Synology Drive. For file access through other standard protocols, refer to the File Services section above)	50,000,000 (applies to files indexed or hosted by Synology Drive. For file access through other standard protocols, refer to the File Services section above)	50,000,000 (applies to files indexed or hosted by Synology Drive. For file access through other standard protocols, refer to the File Services section above)
Notes	Exceeding the recommended numbers above will not block application operations, but may result in longer response time. Utilizing SSD cache can significantly improve performance. Btrfs file system and non-encrypted shared folders were used during the aforementioned testing.	Exceeding the recommended numbers above will not block application operations, but may result in longer response time. Utilizing SSD cache can significantly improve performance. Models with expandable memory are tested with their maximum supported memory. Btrfs file system and non-encrypted shared folders were used during the aforementioned testing.	Exceeding the recommended numbers above will not block application operations, but may result in longer response time. Utilizing SSD cache can significantly improve performance. Models with expandable memory are tested with their maximum supported memory. Btrfs file system and non-encrypted shared folders were used during the aforementioned testing.
Synology Office
Suggested Users	3,000	4,500	4,500
Notes	Suggested users is derived from testing in an environment with 60% idle users (each logging in and viewing documents) and 40% active users (each executing random actions at intervals of 20 to 40 seconds) operating within documents, each document having 30 users. Learn more Client performance may affect maximum simultaneous editing users. Client PCs used for testing: Intel Core i3-3220 / 8GB RAM	Suggested users is derived from testing in an environment with 60% idle users (each logging in and viewing documents) and 40% active users (each executing random actions at intervals of 20 to 40 seconds) operating within documents, each document having 30 users. Learn more Models with expandable memory are tested with their maximum supported memory. Client performance may affect maximum simultaneous editing users. Client PCs used for testing: Intel Core i3-3220 / 8GB RAM	Suggested users is derived from testing in an environment with 60% idle users (each logging in and viewing documents) and 40% active users (each executing random actions at intervals of 20 to 40 seconds) operating within documents, each document having 30 users. Learn more Models with expandable memory are tested with their maximum supported memory. Client performance may affect maximum simultaneous editing users. Client PCs used for testing: Intel Core i3-3220 / 8GB RAM
Virtual Machine Manager
Recommended Virtual Machine Instances		8 (Learn more)	8 (Learn more)
Recommended Virtual DSM Number (Licenses required)		8 (including 1 Free License)	8 (including 1 Free License)
Notes		The specifications vary depending on system configuration and memory size.	The specifications vary depending on system configuration and memory size.
VPN Server
Maximum Connections	40	40	40

Hardware Specs

Hardware Specifications

CPU

CPU Model

RS422+	AMD Ryzen R1600
RS822+	AMD Ryzen V1500B
RS1221+	AMD Ryzen V1500B

CPU Quantity

RS422+	1
RS822+	1
RS1221+	1

CPU Core

RS422+	2
RS822+	4
RS1221+	4

CPU Architecture

RS422+	64-bit
RS822+	64-bit
RS1221+	64-bit

CPU Frequency

RS422+	2.6 (base) / 3.1 (turbo) GHz
RS822+	2.2 GHz
RS1221+	2.2 GHz

Hardware Encryption Engine

RS422+
RS822+
RS1221+

Memory

System Memory

RS422+	2 GB DDR4 ECC
RS822+	2 GB DDR4 ECC SODIMM
RS1221+	4 GB DDR4 ECC SODIMM

Memory Module Pre-installed

RS422+
RS822+	2 GB (2 GB x 1)
RS1221+	4 GB (4 GB x 1)

Total Memory Slots

Maximum Memory Capacity

RS422+
RS822+	32 GB (16 GB x 2)
RS1221+	32 GB (16 GB x 2)

Notes

RS422+	Synology reserves the right to replace memory modules with the same or higher frequency based on supplier's product life cycle status. Rest assured that the compatibility and stability have been strictly verified with the same benchmark to ensure identical performance.
RS822+	Synology reserves the right to replace memory modules with the same or higher frequency based on supplier's product life cycle status. Rest assured that the compatibility and stability have been strictly verified with the same benchmark to ensure identical performance. Please select Synology memory modules for optimum compatibility and reliability. Synology will not provide complete product warranty or technical support if non-Synology memory modules are used for memory expansion. For multi-module memory configurations, all modules must be identical and share the same model number. Check the Product Manual of your Synology product for recommended memory configurations.
RS1221+	Synology reserves the right to replace memory modules with the same or higher frequency based on supplier's product life cycle status. Rest assured that the compatibility and stability have been strictly verified with the same benchmark to ensure identical performance. Please select Synology memory modules for optimum compatibility and reliability. Synology will not provide complete product warranty or technical support if non-Synology memory modules are used for memory expansion. For multi-module memory configurations, all modules must be identical and share the same model number. Check the Product Manual of your Synology product for recommended memory configurations.

Storage

Drive Bays

RS422+	4
RS822+	4
RS1221+	8

Maximum Drive Bays with Expansion Unit

RS422+
RS822+	8 (RX418 x 1)
RS1221+	12 (RX418 x 1)

Drive Type (See all supported drives)

RS422+	3.5" SATA HDD 2.5" SATA SSD
RS822+	3.5" SATA HDD 2.5" SATA SSD
RS1221+	3.5" SATA HDD 2.5" SATA HDD 2.5" SATA SSD

Hot Swappable Drive*

RS422+
RS822+
RS1221+

External Ports

RJ-45 1GbE LAN Port

RS422+	2
RS822+	4
RS1221+	4

USB 3.2 Gen 1 Port*

RS422+	1
RS822+	2
RS1221+	2

Expansion Port

Expansion Port Type

RS422+
RS822+	eSATA
RS1221+	eSATA

Notes

RS422+	This device's 1GbE LAN ports have a maximum transmission unit (MTU) size of 1,500 bytes.
RS822+	This device's 1GbE LAN ports have a maximum transmission unit (MTU) size of 1,500 bytes.
RS1221+

PCIe

PCIe Expansion

RS422+	1 x Gen3 x2 network upgrade slot
RS822+	1 x Gen3 x8 slot (x4 link)
RS1221+	1 x Gen3 x8 slot (x4 link)

Appearance

Form Factor (RU)

RS422+	1U
RS822+	1U
RS1221+	2U

Size (Height x Width x Depth)

RS422+	44 mm x 478 mm x 327.5 mm
RS822+	44 mm x 480 mm x 492.6 mm
RS1221+	88 mm x 482 mm x 306.6 mm

Weight

RS422+	4.38 kg
RS822+	6.4 kg
RS1221+	6.9 kg

Rack Installation Support*

RS422+	4-post 19" rack (Synology Rail Kit - RKM114/RKS-02) 2-post 19" rack (direct mounting)
RS822+	4-post 19" rack (Synology Rail Kit - RKM114/RKS-02)
RS1221+	4-post 19" rack (Synology Rail Kit - RKM114/RKS-02) 2-post 19" rack (direct mounting)

Notes

RS422+	The rail kit is sold separately
RS822+	The rail kit is sold separately
RS1221+	The rail kit is sold separately

Others

System Fan

RS422+	40 mm x 40 mm x 3 pcs
RS822+	40 mm x 40 mm x 3 pcs
RS1221+	80 mm x 80 mm x 2 pcs

Fan Speed Mode

RS422+	Full-Speed Mode Cool Mode Quiet Mode
RS822+	Full-Speed Mode Cool Mode Quiet Mode
RS1221+	Full-Speed Mode Cool Mode Quiet Mode

Power Recovery

RS422+
RS822+
RS1221+

Noise Level*

RS422+	28.5 dB(A)
RS822+	27.4 dB(A)
RS1221+	37.8 dB(A)

Scheduled Power On / Off

RS422+
RS822+
RS1221+

Wake on LAN / WAN

RS422+
RS822+
RS1221+

Power Supply Unit / Adapter

RS422+	100 watts
RS822+	150 watts
RS1221+	250 watts

AC Input Power Voltage

RS422+	100V to 240V AC
RS822+	100 V to 240 V AC
RS1221+	100 V to 240 V AC

Power Frequency

RS422+	50/60 Hz, Single Phase
RS822+	50/60 Hz, Single Phase
RS1221+	50/60 Hz, Single Phase

Power Consumption

RS422+	37.93 watts (Access) 13.43 watts (HDD Hibernation)
RS822+	47.69 watts (Access) 16.7 watts (HDD Hibernation)
RS1221+	49.89 watts (Access) 22.64 watts (HDD Hibernation)

British Thermal Unit

RS422+	129.42 BTU/hr (Access) 45.83 BTU/hr (HDD Hibernation)
RS822+	162.83 BTU/hr (Access) 57.02 BTU/hr (HDD Hibernation)
RS1221+	170.23 BTU/hr (Access) 77.25 BTU/hr (HDD Hibernation)

Notes

RS422+	For more information on how power consumption is measured, refer to this article. Noise testing was conducted with the Synology system fully installed with Synology SATA HDDs and in an idle state. Two GRAS 40AE microphones are placed at a 1 m distance from the front and rear of the device. Background noise: 16.49-17.51 dB(A); Temperature: 24.25-25.75˚C; Humidity: 58.2-61.8%
RS822+	For more information on how power consumption is measured, refer to this article. Noise testing was conducted with the Synology system fully installed with Synology SATA HDDs and in an idle state. Two GRAS 40AE microphones are placed at a 1 m distance from the front and rear of the device. Background noise: 16.49-17.51 dB(A); Temperature: 24.25-25.75˚C; Humidity: 58.2-61.8%
RS1221+	Power consumption is measured when it is fully loaded with Western Digital 1TB WD10EFRX hard drive(s). Noise Level Testing Environment: Fully loaded with Seagate 2TB ST2000VN000 hard drive(s) in the idle state. Two G.R.A.S. Type 40AE microphones, each set up 1 meter away from the Synology NAS at the front and rear. Background noise: 16.49-17.51 dB(A); Temperature: 24.25-25.75˚C; Humidity: 58.2-61.8%

Temperature

Operating Temperature

RS422+	0°C to 35°C (32°F to 95°F)
RS822+	0°C to 35°C (32°F to 95°F)
RS1221+	0°C to 35°C (32°F to 95°F)

Storage Temperature

RS422+	-20°C to 60°C (-5°F to 140°F)
RS822+	-20°C to 60°C (-5°F to 140°F)
RS1221+	-20°C to 60°C (-5°F to 140°F)

Relative Humidity

RS422+	5% to 95% RH
RS822+	5% to 95% RH
RS1221+	5% to 95% RH

Certification

RS422+	FCC CE BSMI VCCI RCM UKCA EAC CCC KC BIS
RS822+	FCC CE BSMI VCCI RCM UKCA EAC CCC KC UL
RS1221+	FCC CE BSMI VCCI RCM EAC CCC KC BIS UL

Warranty

RS422+	3-year hardware warranty, extendable to 5 years with Extended Warranty Plus
RS822+	3-year hardware warranty, extendable to 5 years with Extended Warranty Plus
RS1221+	3-year hardware warranty, extendable to 5 years with Extended Warranty Plus

Notes

RS422+	The warranty period starts from the purchase date as stated on your purchase receipt. (Learn more) Extended Warranty Plus is only available in Europe and North America. Refer to the Extended Warranty Plus website for details on supported countries/regions. (Learn more)
RS822+	The warranty period starts from the purchase date as stated on your purchase receipt. (Learn more) Extended Warranty Plus is only available in Europe and North America. Refer to the Extended Warranty Plus website for details on supported countries/regions. (Learn more)
RS1221+	The warranty period starts from the purchase date as stated on your purchase receipt. (Learn more) Extended Warranty Plus is only available in Europe and North America. Refer to the Extended Warranty Plus website for details on supported countries/regions. (Learn more)

Environment

RS422+	RoHS Compliant
RS822+	RoHS Compliant
RS1221+	RoHS Compliant

Packaging Content

RS422+	Main Unit X 1 Accessory Pack X 1 AC Power Cord X 1 Quick Installation Guide X 1
RS822+	Main Unit X 1 Accessory Pack X 1 AC Power Cord X 1 Quick Installation Guide X 1
RS1221+	Main Unit X 1 Accessory Pack X 1 AC Power Cord X 1 C13 to C14 power cord x 1 Quick Installation Guide X 1

Optional Accessories

RS422+	Enterprise Series 3.5" SATA HDD: HAT5300 Series Plus Series 3.5" SATA HDD: HAT3300 Series Enterprise Series 2.5" SATA SSD: SAT5200 Series 10GbE Network Upgrade Module: E10G22-T1-Mini Rail Kit Sliding: RKS-02 Rail Kit Mounted: RKM114*
RS822+	DDR4 ECC SODIMM: D4ES02-4G/D4ES02-8G/D4ES01-16G Expansion Units: RX418 Enterprise Series 3.5" SATA HDD: HAT5300 Series Plus Series 3.5" SATA HDD: HAT3300 Series Enterprise Series 2.5" SATA SSD: SAT5200 Series M.2 SSD & 10GbE Combo Adapter Card: E10M20-T1 M.2 SSD Adapter Card: M2D20/M2D18 25GbE Network Interface Card: E25G30-F2 10GbE Network Interface Card: E10G30-F2/E10G30-T2/E10G18-T1 Rail Kit Sliding: RKS-02 Rail Kit Mounted: RKM114*
RS1221+	DDR4 ECC SODIMM: D4ES01-4G/D4ES01-8G/D4ECSO-2666-16G Expansion Units: RX418 Enterprise Series 3.5" SATA HDD: HAT5300 Series Plus Series 3.5" SATA HDD: HAT3300 Series Enterprise Series 2.5" SATA SSD: SAT5200 Series M.2 SSD & 10GbE Combo Adapter Card: E10M20-T1 M.2 SSD Adapter Card: M2D20/M2D18 25GbE Network Interface Card: E25G30-F2 10GbE Network Interface Card: E10G30-F2/E10G30-T2/E10G18-T1 Rail Kit Sliding: RKS-02 Rail Kit Mounted: RKM114*

Notes

RS422+	Certain items may not be available in your location. Please contact your local distributors for more information.
RS822+	Certain items may not be available in your location. Please contact your local distributors for more information. Upgrade to DSM 7.2-64551 or later before installing the M2D18.
RS1221+	Certain items may not be available in your location. Please contact your local distributors for more information. Upgrade to DSM 7.2-64551 or later before installing the M2D18. All memory modules will operate at the maximum frequency specified by the CPU manufacturer.

Software Specs

DSM Specifications

Storage Management

Maximum Single Volume Size

Maximum Internal Volume Number

SSD Read/Write Cache (Determining cache size)

RS422+
RS822+
RS1221+

SSD TRIM

RS422+
RS822+
RS1221+

Supported RAID Type

RS422+	Synology Hybrid RAID Basic JBOD RAID 0 RAID 1 RAID 5 RAID 6 RAID 10
RS822+	Synology Hybrid RAID Basic JBOD RAID 0 RAID 1 RAID 5 RAID 6 RAID 10
RS1221+	Synology Hybrid RAID Basic JBOD RAID 0 RAID 1 RAID 5 RAID 6 RAID 10

RAID Migration

RS422+	Basic to RAID 1 Basic to RAID 5 RAID 1 to RAID 5 RAID 5 to RAID 6
RS822+	Basic to RAID 1 Basic to RAID 5 RAID 1 to RAID 5 RAID 5 to RAID 6
RS1221+	Basic to RAID 1 Basic to RAID 5 RAID 1 to RAID 5 RAID 5 to RAID 6

Volume Expansion with Larger HDDs

RS422+	Synology Hybrid RAID RAID 1 RAID 5 RAID 6 RAID 10
RS822+	Synology Hybrid RAID RAID 1 RAID 5 RAID 6 RAID 10
RS1221+	Synology Hybrid RAID RAID 1 RAID 5 RAID 6 RAID 10

Volume Expansion by Adding a HDD

RS422+	Synology Hybrid RAID JBOD RAID 5
RS822+	Synology Hybrid RAID JBOD RAID 5 RAID 6 (with Expansion Unit)
RS1221+	Synology Hybrid RAID JBOD RAID 5 RAID 6

Global Hot Spare Supported RAID Type

RS422+	Synology Hybrid RAID RAID 1 RAID 5
RS822+	Synology Hybrid RAID RAID 1 RAID 5 RAID 6 (with Expansion Unit) RAID 10 (with Expansion Unit)
RS1221+	Synology Hybrid RAID RAID 1 RAID 5 RAID 6 RAID 10

Notes

RS422+	Usable capacity for each volume will be lower than the maximum volume size and is dependent on the filesystem and the amount of system metadata stored. Actual maximum storage pool and volume sizes vary depending on drives used, the number of drive bays available, and the RAID configuration.
RS822+	Usable capacity for each volume will be lower than the maximum volume size and is dependent on the filesystem and the amount of system metadata stored. Each internal volume (may consist of multiple drives) is expandable up to 108TB.
RS1221+	Usable capacity for each volume will be lower than the maximum volume size and is dependent on the filesystem and the amount of system metadata stored. Each internal volume (may consist of multiple drives) is expandable up to 108TB.

File System

Internal Drives

RS422+	Btrfs ext4
RS822+	Btrfs ext4
RS1221+	Btrfs ext4

External Drives

RS422+	Btrfs ext4 ext3 FAT NTFS HFS+ exFAT
RS822+	Btrfs ext4 ext3 FAT NTFS HFS+ exFAT
RS1221+	Btrfs ext4 ext3 FAT NTFS HFS+ exFAT

File Services

File Protocol

RS422+	SMB AFP NFS FTP WebDAV Rsync
RS822+	SMB AFP NFS FTP WebDAV Rsync
RS1221+	SMB AFP NFS FTP WebDAV Rsync

Maximum Concurrent SMB/AFP/FTP Connections

Maximum Concurrent SMB/AFP/FTP Connections (with RAM expansion)

RS422+
RS822+	2,000
RS1221+	2,000

Windows Access Control List (ACL) Integration

RS422+
RS822+
RS1221+

NFS Kerberos Authentication

RS422+
RS822+
RS1221+

Notes

RS422+	The testing standard was based on the maximum number of concurrent connections supported by this model. During the testing, 25% of the connections were used to transfer files concurrently. The transfer process guaranteed that the connections were not interrupted; the minimum transfer speed was not guaranteed.
RS822+	Regarding data concerning tests with RAM expansion, all memory slots are installed with the maximum capacity of supported RAM. The testing standard was based on the maximum number of concurrent connections supported by this model. During the testing, 25% of the connections were used to transfer files concurrently. The transfer process guaranteed that the connections were not interrupted; the minimum transfer speed was not guaranteed.
RS1221+	Regarding data concerning tests with RAM expansion, all memory slots are installed with the maximum capacity of supported RAM. The testing standard was based on the maximum number of concurrent connections supported by this model. During the testing, 25% of the connections were used to transfer files concurrently. The transfer process guaranteed that the connections were not interrupted; the minimum transfer speed was not guaranteed.

Account & Shared Folder

Maximum Local User Accounts

Maximum Local Groups

Maximum Shared Folder

Maximum Shared Folder Sync Tasks

Hybrid Share

Hybrid Share Folder Number

Hyper Backup

Folder and Package Backup

RS422+
RS822+
RS1221+

Entire System Backup

RS422+
RS822+
RS1221+

Notes

RS422+	Full-system backup requires DSM 7.2 or later.
RS822+	Full-system backup requires DSM 7.2 or later.
RS1221+	Full-system backup requires DSM 7.2 or later.

High Availability

Synology High Availability

RS422+
RS822+
RS1221+

Log Center

RS422+
RS822+
RS1221+

Syslog Events per Second

Virtualization

VMware ESXi 6.5 and VAAI

RS422+
RS822+
RS1221+

Windows Server 2016

RS422+
RS822+
RS1221+

Windows Server 2019

RS422+
RS822+
RS1221+

Windows Server 2022

RS422+
RS822+
RS1221+

Citrix Ready

RS422+
RS822+
RS1221+

OpenStack

RS422+
RS822+
RS1221+

General Specifications

Supported Protocols

RS422+	SMB1 (CIFS), SMB2, SMB3, NFSv3, NFSv4, NFSv4.1, NFS Kerberized sessions, iSCSI, HTTP, HTTPs, FTP, SNMP, LDAP, CalDAV
RS822+	SMB1 (CIFS), SMB2, SMB3, NFSv3, NFSv4, NFSv4.1, NFS Kerberized sessions, iSCSI, HTTP, HTTPs, FTP, SNMP, LDAP, CalDAV
RS1221+	SMB1 (CIFS), SMB2, SMB3, NFSv3, NFSv4, NFSv4.1, NFS Kerberized sessions, iSCSI, HTTP, HTTPs, FTP, SNMP, LDAP, CalDAV

Supported Browsers

RS422+	Chrome Firefox Edge Safari
RS822+	Chrome Firefox Edge Safari
RS1221+	Chrome Firefox Edge Safari

Supported Language

RS422+	English, Deutsch, Français, Italiano, Español, Dansk, Norsk, Svenska, Nederlands, Русский, Polski, Magyar, Português do Brasil, Português Europeu, Türkçe, Český, ภาษาไทย, 日本語, 한국어, 繁體中文, 简体中文
RS822+	English, Deutsch, Français, Italiano, Español, Dansk, Norsk, Svenska, Nederlands, Русский, Polski, Magyar, Português do Brasil, Português Europeu, Türkçe, Český, ภาษาไทย, 日本語, 한국어, 繁體中文, 简体中文
RS1221+	English, Deutsch, Français, Italiano, Español, Dansk, Norsk, Svenska, Nederlands, Русский, Polski, Magyar, Português do Brasil, Português Europeu, Türkçe, Český, ภาษาไทย, 日本語, 한국어, 繁體中文, 简体中文

Notes

RS422+	For an updated list of supported browser versions, check the DSM Technical Specifications.
RS822+	For an updated list of supported browser versions, check the DSM Technical Specifications.
RS1221+	For an updated list of supported browser versions, check the DSM Technical Specifications.

Add-on Packages view the complete package list

Central Management System

RS422+
RS822+
RS1221+

Synology Chat

RS422+
RS822+
RS1221+

Suggested Users

Notes

RS422+	Measured with simulated users, each with an average record of 20,000 messages, emojis, or stickers. The required server response time is below ten seconds. Models with expandable memory are tested with their maximum supported memory.
RS822+	Measured with simulated users, each with an average record of 20,000 messages, emojis, or stickers. The required server response time is below ten seconds. Models with expandable memory are tested with their maximum supported memory.
RS1221+	Models with expandable memory are tested with their maximum supported memory.

Download Station

RS422+
RS822+
RS1221+

Maximum Concurrent Download Tasks

SAN Manager

RS422+
RS822+
RS1221+

Maximum iSCSI Target Number

Maximum LUN

LUN Clone/Snapshot, Windows ODX

RS422+
RS822+
RS1221+

Synology MailPlus / MailPlus Server

RS422+
RS822+
RS1221+

Free Email Accounts

RS422+
RS822+	5 (Additional accounts require purchase of licenses)
RS1221+	5 (Additional accounts require purchase of licenses)

Suggested Users

RS422+
RS822+	750
RS1221+	750

Notes

RS422+
RS822+	Suggested users is derived from testing in an environment with 20% heavy users (each with 20,000 pre-populated emails and receiving 240 emails per day) and 80% light users (each receiving an average of 20 emails per day). Learn more The performance of the mail system will slightly decrease in high-availability mode due to data synchronization between the two servers. Functions that were enabled in all of the tests above: anti-spam, anti-virus, DNSBL, greylist, content scan, full-text search (English only). Models with expandable memory are tested with their maximum supported memory. To estimate the RAM requirement for your NAS, please read this article.
RS1221+	Suggested users is derived from testing in an environment with 20% heavy users (each with 20,000 pre-populated emails and receiving 240 emails per day) and 80% light users (each receiving an average of 20 emails per day). Learn more The performance of the mail system will slightly decrease in high-availability mode due to data synchronization between the two servers. Functions that were enabled in all of the tests above: anti-spam, anti-virus, DNSBL, greylist, content scan, full-text search (English only). Models with expandable memory are tested with their maximum supported memory. To estimate the RAM requirement for your NAS, please read this article.

Media Server

RS422+
RS822+
RS1221+

DLNA Compliance

RS422+
RS822+
RS1221+

Synology Photos

RS422+
RS822+
RS1221+

Facial Recognition

RS422+
RS822+
RS1221+

Object Recognition

RS422+
RS822+
RS1221+

Notes

RS422+
RS822+	Object recognition requires an upgrade of memory capacity to a minimum of 4 GB.
RS1221+

Snapshot Replication

RS422+
RS822+
RS1221+

Maximum Snapshots per Shared Folder

Maximum of System Snapshots

Surveillance Station

RS422+
RS822+
RS1221+

Default Licenses

RS422+	2 (Additional cameras require purchase of licenses)
RS822+	2 (Additional cameras require purchase of licenses)
RS1221+	2 (Additional cameras require purchase of licenses)

Suggested Maximum IP Cameras and Total FPS (H.264)

RS422+	1080p: 40 channels, 800 FPS 3M: 35 channels, 350 FPS 5M: 28 channels, 280 FPS 4K: 17 channels, 170 FPS
RS822+	1080p: 40 channels, 800 FPS 3M: 35 channels, 350 FPS 5M: 28 channels, 280 FPS 4K: 17 channels, 170 FPS
RS1221+	1080p: 40 channels, 1050 FPS 3M: 40 channels, 600 FPS 5M: 40 channels, 440 FPS 4K: 32 channels, 320 FPS

Suggested Maximum IP Cameras and Total FPS (H.265)

RS422+	1080p: 40 channels, 1200 FPS 3M: 40 channels, 600 FPS 5M: 40 channels, 480 FPS 4K: 20 channels, 200 FPS
RS822+	1080p: 40 channels, 1200 FPS 3M: 40 channels, 600 FPS 5M: 40 channels, 480 FPS 4K: 20 channels, 200 FPS
RS1221+	1080p: 40 channels, 1200 FPS 3M: 40 channels, 1120 FPS 5M: 40 channels, 600 FPS 4K: 40 channels, 480 FPS

Notes

RS422+	Performance figures are obtained from testing conducted with the device fully populated with drives, with their default memory configuration, and under a continuous recording setup. Actual system capabilities may vary based on configuration, drive performance, enabled features, and the presence of additional workloads. Use NVR Selector to quickly find a suitable model based on your requirements. The number of streams that can be viewed simultaneously is twice the suggested maximum number of cameras. For example, if the suggested maximum number of cameras for a model is 10 under H.264, 1080p, the model can support up to 20 streams of the same specification at the same time.
RS822+	Performance figures are obtained from testing conducted with the device fully populated with drives, with their default memory configuration, and under a continuous recording setup. Actual system capabilities may vary based on configuration, drive performance, enabled features, and the presence of additional workloads. Use NVR Selector to quickly find a suitable model based on your requirements. The number of streams that can be viewed simultaneously is twice the suggested maximum number of cameras. For example, if the suggested maximum number of cameras for a model is 10 under H.264, 1080p, the model can support up to 20 streams of the same specification at the same time.
RS1221+	Performance figures are obtained from testing conducted with the device fully populated with drives, with their default memory configuration, and under a continuous recording setup. Actual system capabilities may vary based on configuration, drive performance, enabled features, and the presence of additional workloads. Use NVR Selector to quickly find a suitable model based on your requirements. The number of streams that can be viewed simultaneously is twice the suggested maximum number of cameras. For example, if the suggested maximum number of cameras for a model is 10 under H.264, 1080p, the model can support up to 20 streams of the same specification at the same time.

Synology Drive

RS422+
RS822+
RS1221+

Recommended Number of Concurrent Sync Clients

RS422+	350 (the number of connections that can be maintained when the recommended number of hosted files was reached)
RS822+	550 (the number of connections that can be maintained when the recommended number of hosted files was reached)
RS1221+	550 (the number of connections that can be maintained when the recommended number of hosted files was reached)

Recommended Number of Hosted Files

RS422+	5,000,000 (applies to files indexed or hosted by Synology Drive. For file access through other standard protocols, refer to the File Services section above)
RS822+	50,000,000 (applies to files indexed or hosted by Synology Drive. For file access through other standard protocols, refer to the File Services section above)
RS1221+	50,000,000 (applies to files indexed or hosted by Synology Drive. For file access through other standard protocols, refer to the File Services section above)

Notes

RS422+	Exceeding the recommended numbers above will not block application operations, but may result in longer response time. Utilizing SSD cache can significantly improve performance. Btrfs file system and non-encrypted shared folders were used during the aforementioned testing.
RS822+	Exceeding the recommended numbers above will not block application operations, but may result in longer response time. Utilizing SSD cache can significantly improve performance. Models with expandable memory are tested with their maximum supported memory. Btrfs file system and non-encrypted shared folders were used during the aforementioned testing.
RS1221+	Exceeding the recommended numbers above will not block application operations, but may result in longer response time. Utilizing SSD cache can significantly improve performance. Models with expandable memory are tested with their maximum supported memory. Btrfs file system and non-encrypted shared folders were used during the aforementioned testing.

Synology Office

RS422+
RS822+
RS1221+

Suggested Users

Notes

RS422+	Suggested users is derived from testing in an environment with 60% idle users (each logging in and viewing documents) and 40% active users (each executing random actions at intervals of 20 to 40 seconds) operating within documents, each document having 30 users. Learn more Client performance may affect maximum simultaneous editing users. Client PCs used for testing: Intel Core i3-3220 / 8GB RAM
RS822+	Suggested users is derived from testing in an environment with 60% idle users (each logging in and viewing documents) and 40% active users (each executing random actions at intervals of 20 to 40 seconds) operating within documents, each document having 30 users. Learn more Models with expandable memory are tested with their maximum supported memory. Client performance may affect maximum simultaneous editing users. Client PCs used for testing: Intel Core i3-3220 / 8GB RAM
RS1221+	Suggested users is derived from testing in an environment with 60% idle users (each logging in and viewing documents) and 40% active users (each executing random actions at intervals of 20 to 40 seconds) operating within documents, each document having 30 users. Learn more Models with expandable memory are tested with their maximum supported memory. Client performance may affect maximum simultaneous editing users. Client PCs used for testing: Intel Core i3-3220 / 8GB RAM

Virtual Machine Manager

RS422+
RS822+
RS1221+

Recommended Virtual Machine Instances

RS422+
RS822+	8 (Learn more)
RS1221+	8 (Learn more)

Recommended Virtual DSM Number (Licenses required)

RS422+
RS822+	8 (including 1 Free License)
RS1221+	8 (including 1 Free License)

Notes

RS422+
RS822+	The specifications vary depending on system configuration and memory size.
RS1221+	The specifications vary depending on system configuration and memory size.

VPN Server

RS422+
RS822+
RS1221+

Maximum Connections